- Hasumi Kayoko (Takimoto Miori), the newbie investigator at the all-female Hasumi Detective Agency, always observes people and cases in a level-headed manner. She detect lies and secrets, and has a strong sense at justice. Her late father worked at the city news desk of a newspaper, but committed suicide at her 7 year's age. However, the truth lies in darkness and Kayoko's mother, Kyoko (Zaizen Naomi), the agency's director, has been secretly pursuing the facts. An incident becomes the catalyst that entwines Kayoko and the people around her, and the closes in on the truth behind her father's death.